Tripple Axis Accelerometer - LIS302DL

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The LIS302DL is a 3 axis Accelerometer that is able to communicate and be configured via I2C and SPI. It has a selectable range of +-2g or +-8g and data output rates of 100Hz or 400Hz. It also includes two programmable external interrupts which can be triggered in a number of different ways.

Contents

Hooking it up

Pin descriptions:

  • 1.Vdd_IO
  • 2.GND
  • 3.Reserved (connect to Vdd)
  • 4.GND
  • 5.GND
  • 6.Vdd
  • 7.CSSPI enable (logic high = I2C mode,logic low = SPI enabled)
  • 8.INT1
  • 9.INT2
  • 10.GND
  • 11.Reserved (connect to Gnd)
  • 12.SDOSPI serial Data Out,I2C least significant bit of the device address
  • 13.SDAI2C Serial Data, SDISPI Serial Data Input,SDO3-wire interface Serial Data Output
  • 14.SCLI2C Serial Clock, SPCSPI Serial Port Clock

Code

  • Basic register setup
    • CTRL_REG1 (20H)
    • For 100Hz, and +-8g, use 011000111b, or C7h.
    • For 400Hz, and +-2g, use 10000111b, or 87h.
  • Basic data registers
    • WHO_AM_I (0Fh) should always return 3Bh.
    • OUT_X (29h) the most recent data from the X axis.
    • OUT_Y (2Bh) the most recent data from the Y axis.
    • OUT_Z (2Dh) the most recent data from the Z axis.

(note, the data registers are NOT sequential, care should be taken when accessing them. Also the data is stored as 2's complement.)

Other registers provide more information and controls of interrupts and data availability, however they are not necessary for basic functionality.

  • Obtaining g values
    • Depending on the range selected, the accelerometer will have a different sensetivity, 18mg/LSB for +-2g and 72mg/LSB for +-8g. To obtain a g reading the value of the data registers needs to be multiplied by this sensitivity. For example if the OUT_Z register has a value of 1000 then the g force in the Z axis is <math>1000 \times 18=18000mg </math> for a +-2g range.



This page is a Component on bildr. Components are pages about specific parts, and include connection details and code when available.

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NOTE: All information contained within this article is pure opinion. Although this article is intended to help people, it may contain faulty or misleading information. This article is not to be considered professional opinion or advice, and is in no way a replacement for reading all safety/instructional documentation. Always remember to protect yourself when handling/using hazardous materials, as well as test new techniques before using them on projects/work intended to be handed in or used.

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